Relax <reference> tag DTD (#122)

Girgias · web-flow · commit f35be275dfbb · 2024-05-14T15:21:38.000+01:00
DocBook 5.1 and 5.2 allow "Zero or more of" <refentry>, whereas DocBook 5.0 and below required "One or more of" <refentry> cf. https://tdg.docbook.org/tdg/5.2/reference
diff --git a/docbook/docbook-xml/docbook.dtd b/docbook/docbook-xml/docbook.dtd
@@ -2737,7 +2737,7 @@
 
 >
 
-<!ELEMENT reference (((title|titleabbrev|subtitle)*, info?), partintro?, (refentry)+)>
+<!ELEMENT reference (((title|titleabbrev|subtitle)*, info?), partintro?, (refentry)*)>
 
 <!ATTLIST reference
 	xmlns	CDATA	#FIXED	"http://docbook.org/ns/docbook"

Original file line number	Diff line number	Diff line change
`@@ -2737,7 +2737,7 @@`
`2737`	`2737`
`2738`	`2738`	`>`
`2739`	`2739`
`2740`		`-<!ELEMENT reference (((title\|titleabbrev\|subtitle)*, info?), partintro?, (refentry)+)>`
	`2740`	`+<!ELEMENT reference (((title\|titleabbrev\|subtitle), info?), partintro?, (refentry))>`
`2741`	`2741`
`2742`	`2742`	`<!ATTLIST reference`
`2743`	`2743`	`xmlns CDATA #FIXED "http://docbook.org/ns/docbook"`